i've heard everything from 65 to 85, and my betta has always been happy at this slightly higher temperature *shrug*

ice man looks really sick today

after a water change yesterday he didn't look any happier, and when i got up this morning he won't move from the bottom of the tank unless i literally poke him (i did this once because i couldn't see gill movement and thought he was dead...) and refuses to eat. he hasn't eaten for nearly a week now.
any ideas??